﻿using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;

using Storm.TextEditor.Win32.Structs;

namespace Storm.TextEditor.Win32
{
	public static class NativeUser32Api
	{
		#region Fields

		public const int GWL_STYLE = -16;
		public const int WS_CHILD = 0x40000000;

		#endregion

		#region Natives (DllImport)

		[DllImport("user32.dll")]
		public static extern Int32 SendMessage(IntPtr pWnd, UInt32 uMsg,
											   UInt32 wParam, IntPtr lParam);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool AnimateWindow(IntPtr hWnd, uint dwTime, uint dwFlags);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern IntPtr BeginPaint(IntPtr hWnd, ref PAINTSTRUCT ps);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool ClientToScreen(IntPtr hWnd, ref POINTAPI pt);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool DispatchMessage(ref MSG msg);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool DrawFocusRect(IntPtr hWnd, ref RECTAPI rect);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool EndPaint(IntPtr hWnd, ref PAINTSTRUCT ps);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern IntPtr GetDC(IntPtr hWnd);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern IntPtr GetFocus();

		[DllImport("user32.dll", CharSet = CharSet.Auto)]

		public static extern ushort GetKeyState(int virtKey);
		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool GetMessage(ref MSG msg, int hWnd,
											 uint wFilterMin, uint wFilterMax);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern IntPtr GetParent(IntPtr hWnd);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern int GetWindowLong(IntPtr hWnd, int nIndex);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool GetWindowRect(IntPtr hWnd, ref RECTAPI rect);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool HideCaret(IntPtr hWnd);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool InvalidateRect(IntPtr hWnd,
							 ref RECTAPI rect, bool erase);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern IntPtr LoadCursor(IntPtr hInstance, uint cursor);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool MoveWindow(IntPtr hWnd, int x, int y,
											 int width, int height, bool repaint);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool PeekMessage(ref MSG msg, int hWnd, uint wFilterMin,
											  uint wFilterMax, uint wFlag);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool PostMessage(IntPtr hWnd, int Msg,
											  uint wParam, uint lParam);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool ReleaseCapture();

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool ScreenToClient(IntPtr hWnd, ref POINTAPI pt);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern uint SendMessage(IntPtr hWnd, int Msg,
											  uint wParam, uint lParam);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern IntPtr SetCursor(IntPtr hCursor);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern IntPtr SetFocus(IntPtr hWnd);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern int SetWindowLong(IntPtr hWnd, int nIndex, int newLong);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern int SetWindowPos(IntPtr hWnd, IntPtr hWndAfter,
											  int X, int Y, int Width,
											  int Height, uint flags);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool SetWindowRgn(IntPtr hWnd, IntPtr hRgn, bool redraw);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool ShowCaret(IntPtr hWnd);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern int ShowWindow(IntPtr hWnd, short cmdShow);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool SystemParametersInfo(uint uiAction, uint uiParam,
													  ref int bRetValue, uint fWinINI);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool TrackMouseEvent(ref TRACKMOUSEEVENTS tme);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool TranslateMessage(ref MSG msg);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst,
													  ref POINTAPI pptDst,
													  ref SIZE psize, IntPtr hdcSrc,
													  ref POINTAPI pprSrc, int crKey,
													  ref BLENDFUNCTION pblend,
													  int dwFlags);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool UpdateWindow(IntPtr hwnd);

		[DllImport("user32.dll", CharSet = CharSet.Auto)]
		public static extern bool WaitMessage();

		[DllImport("user32.dll")]
		public static extern int SendMessage(IntPtr hWnd, int msg,
											 int wParam, COMPOSITIONFORM lParam);

		[DllImport("user32.dll")]
		public static extern int SendMessage(IntPtr hWnd, int msg,
											 int wParam, LogFont lParam);

		[DllImport("user32.dll", SetLastError = false, CharSet =
			CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
		public static extern int DrawText(IntPtr hDC, string lpString,
										  int nCount, ref RECTAPI Rect, int wFormat);

		[DllImport("user32.dll")]
		public static extern IntPtr GetDesktopWindow();

		[DllImport("user32.dll", EntryPoint = "SendMessage")]
		public static extern int SendMessage(IntPtr hWND, int message,
											 int WParam, int LParam);

		[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention =
			CallingConvention.StdCall)]
		public static extern IntPtr GetWindowDC(IntPtr hWND);

		[DllImport("user32.dll")]
		public static extern IntPtr WindowFromDC(int hdc);

		[DllImport("user32.dll", SetLastError = false, CharSet = CharSet.Auto,
			CallingConvention = CallingConvention.StdCall)]
		public static extern int TabbedTextOut(IntPtr hDC, int x, int y,
											   string lpString, int nCount,
											   int nTabPositions,
											   ref int lpnTabStopPositions,
											   int nTabOrigin);

		[DllImport("user32.dll", SetLastError = false, CharSet =
			CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
		public static extern int FillRect(IntPtr hDC, ref RECTAPI rect, IntPtr hBrush);

		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]
		public static extern uint GetTabbedTextExtent(IntPtr hDC, string lpString,
													  int nCount, int nTabPositions,
													  ref int lpnTabStopPositions);

		[DllImport("user32.dll", SetLastError = false, CharSet =
			CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
		public static extern int InvertRect(IntPtr hDC, ref RECTAPI rect);


		[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention =
			CallingConvention.StdCall)]
		public static extern UInt16 GetAsyncKeyState(int vKey);

		[DllImport("user32.dll")]
		public static extern IntPtr CreateWindowEx(
		   uint dwExStyle,
		   string lpClassName,
		   string lpWindowName,
		   uint dwStyle,
		   int x,
		   int y,
		   int nWidth,
		   int nHeight,
		   IntPtr hWndParent,
		   IntPtr hMenu,
		   IntPtr hInstance,
		   IntPtr lpParam);

		#endregion

		#region Non-native

		/// <summary>
		/// Returns whether the given key is currently pressed.
		/// </summary>
		/// <param name="k">Key to check whether is pressed.</param>
		/// <returns>Whether the given key is currently pressed.</returns>
		public static bool IsKeyPressed(Keys k)
		{
			int s = (int)GetAsyncKeyState((int)k);
			s = (s & 0x8000) >> 15;

			return (s == 1);
		}

		/// <summary>
		/// Returns the given Control's DC.
		/// </summary>
		/// <param name="control">Control to return DC of.</param>
		/// <returns>DC of the given Control.</returns>
		public static IntPtr ControlDC(Control control)
		{ return GetDC(control.Handle); }

		/// <summary>
		/// Returns the given color as an integer.
		/// </summary>
		/// <param name="color">Color to convert.</param>
		/// <returns>The given color as an integer.</returns>
		public static int ColorToInt(Color color)
		{ return (color.B << 16 | color.G << 8 | color.R); }

		/// <summary>
		/// Returns the given integer as a color.
		/// </summary>
		/// <param name="color">Integer to convert.</param>
		/// <returns>The given integer as a color.</returns>
		public static Color IntToColor(int color)
		{
			int b = (color >> 16) & 0xFF;
			int g = (color >> 8) & 0xFF;
			int r = (color) & 0xFF;
			return Color.FromArgb(r, g, b);
		}

		#endregion
	}
}
